I'm bumping my topic today, because I believe it will continue to be essential to follow these simple rules. Even when crypto becomes much more widespread, it's of great importance to follow the advice stated in my OP.
Incidents, like Ledger's hack and the aftermath draw a very clear picture how dangerous leaked personal data can get for you.
By keeping you private data for yourself, you'll be able to avoid many problems:
Finally, it's up to everyone to care for their own data and who will gain knowledge about your crypto holdings. As a basic rule, it is always advisable to be careful when in doubt. This also applies to all actions on the Internet that pose a possible threat to privacy.
Once information is revealed, we can’t make it unhappen including all (bad) consequences.